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Net Income Per Share - Computation of Basic and Diluted Net Income per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Earnings Per Share [Abstract]
Net income	$ 37,007	$ 21,941
Shares used in net income per share computation:
Weighted average shares outstanding - basic (in shares)	163,407	162,130
Effect of potentially dilutive equivalent shares (in shares)	4,932	2,173
Weighted average shares outstanding - diluted (in shares)	168,339	164,303
Net income per share:
Net income per share - basic (in dollars per share)	$ 0.23	$ 0.14
Net income per share - diluted (in dollars per share)	$ 0.22	$ 0.13
Anti-dilutive equivalents shares excluded (in shares)	1,400	5,700

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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